> Thanks for all those suggestions. Of course there are platform specific > solutions, > but I'd like to keep the code 100% cross platform everywhere it's possible. > > The issue with file locking, is every OS does not have a system-wide > user-writable standard folder. > There is /tmp on linux/unix which is standard, but AFAIK windows only has > per-user temporary file, and system temp which is not user writable. > > Also QLocalSocket doesn't do the job under windows, as two processes can > listen > on the same name (only one will receive data), the conflict is not reported > by the API. > > It seems there is no very good solution.
Just throwing a hacky idea out there, but what about listening on a UDP socket? - application launches and listens for x seconds, if it doesn't hear anything it assumes it's the only instance and starts broadcasting every 0.5x seconds There's an obvious race condition if two users start the application almost simultaneously not sure how worried about that you are? Sean _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
